Works that are considered in the public domain may be used (i.e., copied) freely, without fear of infringing on copyright. It is always a good idea to attribute your sources.
"Mrs. Winslow's Soothing Syrup." Image # 360, Shields Trade Card Collection, Miami University Libraries-‐Digital Library Program. http://digital.lib.muohio.edu/cdm/ref/collection/tradecards/id/86.
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